Al -alloy door & window with interior knot formula structure

The utility model relates to an al -alloy door & window especially relates to an al -alloy door & window with interior knot formula structure. It solves al -alloy door & window that prior art exists when the installation, and buckle structure is in surface department, therefore inside the gap that can see through the buckle such as dust, water enter into door and window, the leakproofness was relatively poor to because the buckle exposes outside, easy ageing the deformation, thus cause the technical problem that door and window's life is short etc.. The utility model discloses an outdoor section bar, the inner of outdoor section bar is equipped with indoor first section bar, indoor first section bar upper portion is connected with indoor second section bar through the buckle, the lower surface middle part of indoor first section bar is connected with first buckle, first buckle is to indoor extension, first buckle is connected with the second buckle, the second buckle is connected on indoor third section bar, the second buckle stretches into in the cavity between first buckle and the indoor first section bar rectangular frame, be equipped with the filler between indoor third section bar and the outdoor section bar.